Electronics MCQ & Objective Questions
Electronics is a crucial subject for students preparing for school exams and competitive tests in India. Mastering this topic not only enhances your understanding of fundamental concepts but also boosts your confidence in tackling objective questions. Practicing MCQs and important questions in Electronics helps you identify your strengths and weaknesses, ensuring effective exam preparation.
What You Will Practise Here
Basic concepts of current, voltage, and resistance
Understanding of Ohm's Law and its applications
Key components such as resistors, capacitors, and transistors
Fundamentals of circuit diagrams and analysis
Principles of alternating current (AC) and direct current (DC)
Signal processing and its applications in real-world scenarios
Important formulas related to power, energy, and circuit calculations
Exam Relevance
Electronics is a significant topic in various examinations, including CBSE, State Boards, NEET, and JEE. Students can expect questions that assess their understanding of basic concepts, circuit analysis, and application of theories. Common question patterns include multiple-choice questions that test both theoretical knowledge and practical application, making it essential to practice thoroughly.
Common Mistakes Students Make
Confusing the concepts of AC and DC, leading to incorrect answers.
Overlooking the significance of units in calculations, resulting in errors.
Misinterpreting circuit diagrams, which can lead to faulty analysis.
Neglecting to apply Ohm's Law correctly in problem-solving.
FAQs
Question: What are the key topics to focus on in Electronics for exams?Answer: Focus on circuit analysis, basic components, Ohm's Law, and signal processing.
Question: How can I improve my performance in Electronics MCQs?Answer: Regular practice of MCQs and understanding the underlying concepts will significantly enhance your performance.
Don't wait any longer! Dive into our Electronics MCQs and practice questions to solidify your understanding and excel in your exams. Your success starts with the right preparation!
Q. What is the primary use of a FET in analog circuits?
A.
Switching
B.
Signal amplification
C.
Rectification
D.
Voltage regulation
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Solution
FETs are primarily used for signal amplification in analog circuits due to their high input impedance.
Correct Answer:
B
— Signal amplification
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Q. What is the primary use of a phototransducer?
A.
To convert light into electrical signals
B.
To convert sound into electrical signals
C.
To convert heat into electrical signals
D.
To convert mechanical motion into electrical signals
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Solution
Phototransducers are used to convert light into electrical signals.
Correct Answer:
A
— To convert light into electrical signals
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Q. What is the primary use of a Schmitt trigger?
A.
To amplify signals
B.
To convert analog signals to digital
C.
To provide hysteresis in signal processing
D.
To rectify AC signals
Show solution
Solution
A Schmitt trigger is used to provide hysteresis in signal processing, ensuring clean transitions between high and low states.
Correct Answer:
C
— To provide hysteresis in signal processing
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Q. What is the primary use of a timer in electronic circuits?
A.
To amplify signals
B.
To measure resistance
C.
To generate time delays
D.
To rectify AC signals
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Solution
Timers are used in circuits to generate precise time delays or to create timing sequences.
Correct Answer:
C
— To generate time delays
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Q. What is the primary use of a Zener diode in AC circuits?
A.
Rectification
B.
Voltage regulation
C.
Signal amplification
D.
Current limiting
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Solution
Zener diodes are primarily used for voltage regulation in AC circuits, maintaining a constant output voltage despite variations in input voltage.
Correct Answer:
B
— Voltage regulation
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Q. What is the primary use of an active low-pass filter using an op-amp?
A.
To amplify high-frequency signals
B.
To allow low-frequency signals to pass while attenuating high frequencies
C.
To rectify AC signals
D.
To provide isolation between circuits
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Solution
An active low-pass filter allows low-frequency signals to pass while attenuating high-frequency signals, using an op-amp for gain.
Correct Answer:
B
— To allow low-frequency signals to pass while attenuating high frequencies
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Q. What is the primary use of an op-amp as a peak detector?
A.
To measure average voltage
B.
To store the peak value of an input signal
C.
To amplify low-frequency signals
D.
To filter out noise
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Solution
An op-amp configured as a peak detector is used to store the peak value of an input signal for later retrieval.
Correct Answer:
B
— To store the peak value of an input signal
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Q. What is the primary use of an operational amplifier (op-amp) in AC circuits?
A.
To rectify AC to DC
B.
To amplify AC signals
C.
To filter DC signals
D.
To convert AC to digital signals
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Solution
The primary use of an operational amplifier (op-amp) in AC circuits is to amplify AC signals.
Correct Answer:
B
— To amplify AC signals
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Q. What is the primary use of an operational amplifier?
A.
To rectify AC signals
B.
To amplify voltage signals
C.
To switch electronic devices
D.
To store data
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Solution
Operational amplifiers are primarily used to amplify voltage signals in various applications.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the primary use of BJTs in analog circuits?
A.
Switching
B.
Signal amplification
C.
Voltage regulation
D.
Oscillation
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Solution
BJTs are primarily used for signal amplification in analog circuits.
Correct Answer:
B
— Signal amplification
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Q. What is the primary use of capacitors in rectifier circuits?
A.
To increase voltage
B.
To filter out noise
C.
To store energy
D.
To convert AC to DC
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Solution
Capacitors are used in rectifier circuits to filter out noise and smooth the output voltage.
Correct Answer:
B
— To filter out noise
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Q. What is the primary winding of a transformer connected to?
A.
A load
B.
A power source
C.
A capacitor
D.
A resistor
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Solution
The primary winding of a transformer is connected to a power source, which provides the input voltage.
Correct Answer:
B
— A power source
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Q. What is the principle of operation of a transformer?
A.
Electromagnetic induction
B.
Capacitance
C.
Resistance heating
D.
Thermal conduction
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Solution
Transformers operate on the principle of electromagnetic induction, where a changing magnetic field induces voltage in a coil.
Correct Answer:
A
— Electromagnetic induction
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Q. What is the purpose of a differential amplifier?
A.
To amplify a single-ended signal
B.
To amplify the difference between two input signals
C.
To rectify AC signals
D.
To provide isolation between circuits
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Solution
A differential amplifier amplifies the difference between two input signals, rejecting any common-mode noise.
Correct Answer:
B
— To amplify the difference between two input signals
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Q. What is the purpose of a rectifier in an electronic circuit?
A.
To amplify signals
B.
To convert AC to DC
C.
To filter noise
D.
To store energy
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Solution
A rectifier converts alternating current (AC) to direct current (DC) for use in electronic devices.
Correct Answer:
B
— To convert AC to DC
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Q. What is the purpose of a Schmitt trigger?
A.
To amplify signals
B.
To convert analog signals to digital
C.
To provide hysteresis in signal processing
D.
To rectify AC signals
Show solution
Solution
A Schmitt trigger provides hysteresis, which helps in cleaning up noisy signals.
Correct Answer:
C
— To provide hysteresis in signal processing
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Q. What is the purpose of an operational amplifier (op-amp) in AC applications?
A.
To convert AC to DC
B.
To amplify AC signals
C.
To rectify AC signals
D.
To filter AC signals
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Solution
Operational amplifiers are used to amplify AC signals, providing high gain and the ability to process analog signals.
Correct Answer:
B
— To amplify AC signals
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Q. What is the purpose of an operational amplifier (op-amp) in AC circuits?
A.
To convert AC to DC
B.
To amplify AC signals
C.
To filter out noise
D.
To rectify AC signals
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Solution
Op-amps are commonly used to amplify AC signals in various applications.
Correct Answer:
B
— To amplify AC signals
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Q. What is the purpose of an operational amplifier (op-amp) in analog circuits?
A.
To convert digital signals to analog
B.
To amplify voltage signals
C.
To rectify AC signals
D.
To store charge
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Solution
An operational amplifier is primarily used to amplify voltage signals in various analog applications.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the purpose of an operational amplifier in a circuit?
A.
To act as a voltage follower
B.
To amplify voltage differences
C.
To filter signals
D.
All of the above
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Solution
Operational amplifiers can perform various functions including amplification, filtering, and buffering.
Correct Answer:
D
— All of the above
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Q. What is the purpose of an operational amplifier in an RC circuit?
A.
To rectify the signal
B.
To amplify the signal
C.
To filter the signal
D.
To switch the signal
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Solution
Operational amplifiers can be used in RC circuits to filter signals, such as in low-pass or high-pass configurations.
Correct Answer:
C
— To filter the signal
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Q. What is the purpose of an operational amplifier?
A.
To rectify AC signals
B.
To amplify voltage signals
C.
To switch electronic signals
D.
To store charge
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Solution
Operational amplifiers are designed to amplify voltage signals, often used in various analog applications.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the purpose of feedback in op-amp circuits?
A.
To increase gain
B.
To stabilize the output
C.
To reduce power consumption
D.
To isolate the input
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Solution
Feedback is used in op-amp circuits to stabilize the output and control the gain.
Correct Answer:
B
— To stabilize the output
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Q. What is the purpose of the offset null terminals in an operational amplifier?
A.
To adjust the gain
B.
To eliminate noise
C.
To nullify the output voltage when inputs are shorted
D.
To increase bandwidth
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Solution
The offset null terminals are used to nullify the output voltage when the inputs are shorted, correcting for any offset voltage.
Correct Answer:
C
— To nullify the output voltage when inputs are shorted
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Q. What is the relationship between primary and secondary voltage in a transformer?
A.
V1/V2 = N1/N2
B.
V1/V2 = N2/N1
C.
V1 + V2 = N1 + N2
D.
V1 - V2 = N1 - N2
Show solution
Solution
The relationship between primary and secondary voltage is given by V1/V2 = N1/N2, where N is the number of turns.
Correct Answer:
A
— V1/V2 = N1/N2
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Q. What is the resonance frequency in an RLC circuit?
A.
The frequency at which impedance is minimized
B.
The frequency at which current is maximized
C.
The frequency at which energy is stored
D.
The frequency at which voltage is minimized
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Solution
The resonance frequency is the frequency at which the impedance of the circuit is minimized, allowing maximum current flow.
Correct Answer:
A
— The frequency at which impedance is minimized
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Q. What is the response of an RC circuit to a step input?
A.
Exponential decay
B.
Linear decay
C.
Exponential rise
D.
Sinusoidal response
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Solution
The response of an RC circuit to a step input is an exponential rise towards the final voltage level.
Correct Answer:
C
— Exponential rise
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Q. What is the response of an underdamped second-order system to a step input?
A.
Exponential decay
B.
Oscillatory decay
C.
Constant value
D.
Linear increase
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Solution
An underdamped second-order system exhibits an oscillatory decay in response to a step input, characterized by oscillations that gradually decrease in amplitude.
Correct Answer:
B
— Oscillatory decay
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Q. What is the role of a bypass capacitor in a series circuit with an op-amp?
A.
To increase gain
B.
To filter out noise
C.
To decrease output impedance
D.
To stabilize voltage
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Solution
A bypass capacitor is used to filter out noise in a series circuit with an op-amp, improving the stability and performance of the circuit.
Correct Answer:
B
— To filter out noise
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Q. What is the role of a coupling capacitor in amplifier circuits?
A.
To block DC and allow AC signals
B.
To amplify the signal
C.
To provide feedback
D.
To increase bandwidth
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Solution
A coupling capacitor blocks DC while allowing AC signals to pass, which is essential in amplifier circuits.
Correct Answer:
A
— To block DC and allow AC signals
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